rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=9489, q=977 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294955070-4294944568), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g9489 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=3031
rcu: rcu_preempt kthread starved for 10502 jiffies! g9489 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R stack:27432 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6291 Comm: syz.2.101 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:lock_acquire+0x34/0x360
Code: 55 41 54 53 48 83 ec 60 4d 89 ce 45 89 c7 41 89 cc 89 54 24 04 89 f3 49 89 fd 48 8b ac 24 98 00 00 00 65 48 8b 05 bc 62 03 11 <48> 89 44 24 58 0f 1f 44 00 00 65 8b 05 bf 62 03 11 83 f8 08 0f 83
RSP: 0018:ffffc900000077e0 EFLAGS: 00000082
RAX: 96966467727bc300 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88804b027a98
RBP: ffffffff81ada58b R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 0000000000000000
R13: ffff88804b027a98 R14: 0000000000000000 R15: 0000000000000001
FS:  00007fa2eb8146c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31f63fff CR3: 0000000028ca2000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_lock_irqsave+0xa7/0xf0
 hrtimer_try_to_cancel+0x22b/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:cap_capable+0x3b/0x460
Code: 18 89 d3 49 89 f6 49 89 ff 48 bd 00 00 00 00 00 fc ff df e8 77 4e 47 fd 4d 8d a7 90 00 00 00 4c 89 e0 48 c1 e8 03 80 3c 28 00 <74> 08 4c 89 e7 e8 7b c3 aa fd 4d 8b 24 24 4d 39 e6 0f 85 fe 00 00
RSP: 0018:ffffc90006ef7c50 EFLAGS: 00000246
RAX: 1ffff11004a91672 RBX: 0000000000000026 RCX: ffff888020ce5640
RDX: 0000000000000000 RSI: ffffffff8dfdd500 RDI: ffff88802548b300
RBP: dffffc0000000000 R08: ffffc90006ef7e1f R09: 1ffff92000ddefc3
R10: dffffc0000000000 R11: fffff52000ddefc4 R12: ffff88802548b390
R13: 0000000000000002 R14: ffffffff8dfdd500 R15: ffff88802548b300
 security_capable+0xa3/0x2e0
 capable+0x6e/0xe0
 __se_sys_perf_event_open+0x1c0/0x1d70
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2ea98eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa2eb814038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fa2eabd5fa0 RCX: 00007fa2ea98eba9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000100
RBP: 00007fa2eaa11e19 R08: 0000000000000009 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa2eabd6038 R14: 00007fa2eabd5fa0 R15: 00007ffe2ba56818
 </TASK>
